Nobody mentioned sunfire or vanderstein . I have had alot of subs over the years( rel ,velodyne.sunfire,JL audio jbl and vandys never had a hsu personally, no opinion there ). I believe treament is a huge part of a room operating properly.I currently run one sub in my audio room ,2 in my ht room .If i was doing it again personnally i would rather have two 10" or even 8" then one 12" .But thats a whole new debate .lol
good luck ..
good luck ..